JSON to Java Class Converter

JSON to Java Class Converter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Development
Input types: textarea, text
Output type: text
Sample coverage: 4
API ready: Yes

Overview

The JSON to Java Class Converter simplifies backend development by instantly transforming raw JSON payloads into structured Java POJOs. It automatically generates private fields, standard getter and setter methods, and Jackson @JsonProperty annotations to ensure seamless serialization and deserialization.

When to use

When designing Data Transfer Objects (DTOs) for Java backend services that consume external JSON APIs.
When setting up Jackson-compatible model classes for Spring Boot REST controllers.
When converting complex, nested JSON payloads into structured, type-safe Java class hierarchies.

How it works

1Paste your raw JSON payload into the JSON Input text area.
2Specify the name of your main Java class in the Root Type Name field.
3Copy the generated Java code containing private fields, Jackson annotations, getters, and setters.

Use cases

Creating DTOs for Spring Boot applications consuming third-party REST APIs.
Generating Java model classes from mock JSON responses during API integration testing.
Rapidly prototyping Java backend data structures from frontend JSON payloads.

Examples

1. Generating a User Profile DTO

Backend Developer

Background

A developer is integrating a third-party authentication service that returns user profiles in JSON format.

Problem

Manually writing Java classes with Jackson annotations for a multi-field JSON profile is tedious and error-prone.

How to use

Paste the user profile JSON into the input area, set the Root Type Name to 'UserProfile', and copy the generated Java code.

Root Type Name: UserProfile

Outcome

A clean Java class named UserProfile with private fields like name and email, annotated with @JsonProperty, complete with getters and setters.

2. Mapping Nested Order Data

Software Engineer

Background

An engineer needs to process e-commerce order payloads containing nested address and item details.

Problem

Creating nested Java classes manually to match the nested JSON structure takes too much time.

How to use

Input the nested order JSON, set the Root Type Name to 'OrderResponse', and generate the classes.

FAQ

Does this tool support nested JSON objects?

Yes, it automatically generates nested static classes to represent nested JSON structures.

Which JSON library annotations are used?

The tool generates Jackson @JsonProperty annotations for mapping JSON keys to Java fields.

What Java types are mapped from JSON types?

Strings map to String, integers to int/Integer, decimals to double/Double, booleans to boolean, and arrays to List.

Can I customize the name of the main class?

Yes, you can define the main class name using the Root Type Name option.

Does the generated code include getters and setters?

Yes, standard Java getter and setter methods are generated for all private fields.

Root Type Name: OrderResponse

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Generating a User Profile DTO

2. Mapping Nested Order Data

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